I had this problem as well and found out how to work around it. I also tried multiple browsers and found no capcha appeared. The problem was that I was clicking the login/register link at the top right of the page (the one with the little person ico...
So this answer may be late but it is the right one. The first time this happened, I replaced the printer with a new G3200. The probably would have been the same time as pawletto's original post. This time, I was determined to find the answer. Her...